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Pidstat

Pidstat is a command of the sysstat tool that monitors the use of system resources such as CPU, memory, threads, device IO, etc., for all or specified processes. The first run of pidstat displays information from the start of the system, and then running pidstat displays statistics since the last time the command was run. Users can get the statistics they need by specifying the number and time of statistics.

Usage: pidstat [options] [[]]

Options:

[- C] [- d] [- h] [- I] [- l] [- r] [- t] [- u] [- V] [- w]

[- p {[,...] | SELF | ALL}] [- T {TASK | CHILD | ALL}]

Commonly used parameters:

-u: default parameter, which displays the usage statistics of each process

-r: displays memory usage statistics for each process

-d: displays the IO usage of each process

-p: specify the process number

-w: displays the context switch for each process

-t: displays additional information about the statistics of the thread that selected the task

-T {TASK | CHILD | ALL}: TASK means to report independent task,CHILD keyword for statistics of all threads under the reporting process, and ALL means to report all threads under independent task and task.

Note: global statistics for task and child threads are independent of the pidstat option. These statistics do not correspond to the current statistical interval and are collected only when the child thread kill or completes.

-V: version number

-h: shows all activities on one line so that other programs can easily parse

-I: in SMP environment, indicates the CPU utilization / number of cores of the task

-l: displays the command name and all parameters

View CPU usage for all processes

Pidstat and pidstat-u-p ALL are equivalent.

[root@127-0-0-1 ~] # pidstat

Linux 2.6.32-754.22.1.el6.x86_64 (10-130-10-74) 08Accord 06Universe 2020x86mm 6440 CPU)

07:57:55 PM PID usr system guest CPU CPU Command

07:57:55 PM 1 0.00 0.00 0.00 1 init

07:57:55 PM 2 0.00 0.00 0.00 1 kthreadd

07:57:55 PM 3 0.00 0.00 0.00 0 migration/0

07:57:55 PM 4 0.00 0.00 0.00 0 ksoftirqd/0

PID: process ID

% usr: percentage of CPU occupied by processes in user space

% system: percentage of CPU occupied by processes in kernel space

% guest: percentage of CPU occupied by processes in the virtual machine

% CPU: percentage of CPU occupied by the process

CPU: the CPU number of the process

Command: the command corresponding to the current process

Memory usage statistics

[root@127-0-0-1] # pidstat-r

Linux 2.6.32-754.22.1.el6.x86_64 (10-130-10-74) 08Accord 06Universe 2020x86mm 6440 CPU)

08:02:38 PM PID minflt/s majflt/s VSZ RSS MEM Command

08:02:38 PM 1 0.00 0.00 19352 1472 0.00 init

08:02:38 PM 836 0.00 0.00 215600 75416 0.06 redis-server

08:02:38 PM 1630 0.02 0.00 1601196 115652 0.09 mongod

PID: process identifier

Minflt/s: the secondary error that occurs every second of the task, without loading the page from disk

Majflt/s: the main error that occurs every second of the task. The page needs to be loaded from disk.

VSZ: virtual machine address size, virtual memory usage KB

RSS: resident collection size, memory using KB in non-swap area

Command:task command name

IO usage statistics

[root@127-0-0-1] # pidstat-d

Linux 2.6.32-754.22.1.el6.x86_64 (10-130-10-74) 08Accord 06Universe 2020x86mm 6440 CPU)

08:06:08 PM PID kB_rd/s kB_wr/s kB_ccwr/s Command

08:06:08 PM 1 37.59 186.71 1.63 init

08:06:08 PM 584 0.00 0.01 0.00 khugepaged

08:06:08 PM 836 0.00 0.00 0.00 redis-server

08:06:08 PM 1630 0.00 0.04 0.02 mongod

PID: process id

KB_rd/s: KB read from disk per second

KB_wr/s: write to disk KB per second

KB_ccwr/s: KB written to disk for task cancellation. Occurs when the task truncates the dirty pagecache.

Command name of the COMMAND:task

Process context switching

[root@127-0-0-1] # pidstat-w-p 24397

Linux 2.6.32-754.22.1.el6.x86_64 (10-130-10-74) 08Accord 06Universe 2020x86mm 6440 CPU)

08:08:11 PM PID cswch/s nvcswch/s Command

08:08:11 PM 24397 0.00 0.00 mongod

PID: process id

Cswch/s: number of active task context switches per second

Nvcswch/s: number of passive task context switches per second

Command: command name

Displays additional information in addition to the statistics of the thread that selected the task

[root@127-0-0-1] # pidstat-t-p 24397

Linux 2.6.32-754.22.1.el6.x86_64 (10-130-10-74) 08Accord 06Universe 2020x86mm 6440 CPU)

08:09:24 PM TGID TID usr system guest CPU CPU Command

08:09:24 PM 24397-0.00 0.00 0.00 30 mongod

08:09:24 PM-24397 0.00 0.00 0.00 30 | _ _ mongod

08:09:24 PM-24398 0.00 0.00 0.00 21 | _ _ signalP.gThread

08:09:24 PM-24399 0.00 0.00 0.00 2 | _ _ Backgro.kSource

TGID: identifier of the main thread

TID: thread id

% usr: percentage of cpu occupied by processes in user space

% system: percentage of cpu occupied by processes in kernel space

% guest: percentage of cpu occupied by processes in the virtual machine

% CPU: percentage of cpu occupied by the process

CPU: the cpu number of the process

Command: the command corresponding to the current process

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